Gas separations using mixed matrix membranes

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dc.contributor.assigneeThe Board of Regents of the University of Texas System
dc.contributor.assigneeChevron U.S.A. Inc.
dc.creatorStephen J. Miller
dc.creatorWilliam Koros
dc.creatorDe Q. Vu
dc.creatorRajiv Mahajan
dc.date.accessioned2019-10-23T19:32:56Z
dc.date.available2019-10-23T19:32:56Z
dc.date.filed2000-09-20
dc.date.issued2003-01-07
dc.description.abstractMixed matrix membranes capable of separating carbon dioxide from mixtures including carbon dioxide and methane, and processes for purifying methane using the membranes, are disclosed. The membranes are polymer membranes with a selective layer thickness of between about 1000 Angstroms to about 0.005 inch, that include discrete carbon-based molecular sieve particles with sizes of between about 0.5 microns to about 5.0 microns. The preferred ratio of particles to polymer is about 20% to about 50% by volume. A preferred method for preparing the mixed matrix membrane is by dispersing the particles in a solvent, adding a small quantity of the desired polymer or “sizing agent” to “size” or “prime” the particles, adding a polymer, casting a film of the polymer solution, and evaporating the solvent to form a mixed matrix membrane film. The mixed matrix membrane film permits passage of carbon dioxide and methane, but at different permeation rates, such that the ratio of the relative permeation rates of carbon dioxide to methane is larger through the mixed matrix membrane film than through the original polymer. The polymer is preferably a rigid, glassy polymer, more preferably, with a glass transition temperature above about 150° C. The mixed matrix membrane is preferably in the form of a dense film or a hollow fiber. A mixture containing carbon dioxide and methane can be enriched in methane by selective passage of carbon dioxide over methane in a gas-phase process through the membrane.
dc.description.departmentBoard of Regents, University of Texas System
dc.identifier.applicationnumber9666392
dc.identifier.patentnumber6503295
dc.identifier.urihttps://hdl.handle.net/2152/77124
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/4213
dc.publisherUnited States Patent and Trademark Office
dc.relation.ispartofUniversity of Texas Patents
dc.relation.ispartofUniversity of Texas Patents
dc.rights.restrictionOpen
dc.rights.restrictionOpen
dc.subject.cpcB01D69/08
dc.subject.cpcB01D53/228
dc.subject.cpcB01D67/0067
dc.subject.cpcB01D67/0083
dc.subject.cpcB01D69/141
dc.subject.cpcB01D71/021
dc.subject.cpcB01J20/20
dc.subject.cpcB01J20/28026
dc.subject.cpcB01J20/28033
dc.subject.cpcB01J20/2808
dc.subject.cpcB01D2323/08
dc.subject.cpcY10S977/778
dc.subject.cpcY10S977/783
dc.subject.cpcY10S977/786
dc.subject.cpcY10S977/788
dc.subject.cpcY10S977/882
dc.subject.uspc95/51
dc.subject.uspc95/45
dc.subject.uspc95/54
dc.subject.uspc96/4
dc.subject.uspc96/10
dc.subject.uspc96/11
dc.titleGas separations using mixed matrix membranes
dc.typePatent

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